Reported in this paper are chromosome numbers of six species of Mnium from  Qinling Range．  The chromosome number of M．  pseudolycopodioides，n=6，is reported here for the first time．  The counts for M．marginatum and M．lycopoidioides，n=12 and n＝6 respectively，agree with the previous reports，and those for M．laevinerve，M．heterophyllum and M．thomsonii，here all found to be n=6，differs from some or all previously published chromosome numbers for these three species．